Improvements to transportation have a) lowered the costs of shipping goods between countries. b)reduced the number of tariffs on shipped products. c) raised service fees on shipping goods between countries. d) resulted in fewer safety regulations governing shipments.

The right answer is letter A) lowered the costs of shipping goods between countries.

Following the end of the Civil war, the US faced a rapid change in their economic means. With the growth of factories and the subsequent change from subsistence agriculture to commercial agriculture, the needs for a cheaper and fast way of shipping goods between countries also increased.

The result was the improvements in the transportation field. The development of steamboats, canals, and railroads shrank the distance between different regions in the US and foreign markets.

A) lowered the costs of shipping goods between countries.

it increased 6 percent and reached that in 1980

the answer is a, salt plain